I am trying to record for 45 minutes to 1 hour and my camera stops recording after it generates a 4 gig file. I am using 1080p60, loop recording off, gyro off, auto shut-off is off, etc. There is still plenty of space on my sd card (class 10 SanDisk Pixtor), and plenty of battery left. The camera just stops after generating a file of about 4 gigs (about 25 minutes of recording) and doesn't start a new file to continue recording. SD card was formatted in the camera before use. Defective camera????